How to use journalctl to analyze logs in Linux
systemd is the default system manager in most of the major Linux distributions, which comes with a new logging daemon called ‘journald’. For many years, system and kernel logs in …
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6 best tools to monitor disk IO performance in Linux
Disk IO issues (input/output) are one of the most common causes of poor performance on Linux system. This occurs when applications try to quickly read or write too much data …
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How to lock & unlock multiple users in Linux
‘usermod’ & ‘passwd’ commands are used to lock or unlock one user account at a time, but you may need to write some small shell scripts to perform this action …
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How to Kill user sessions in Linux
Sometimes we might need to kill a user session in Linux based on requests, which can be done by sending SIGNALS with kill command. We need to send one of …
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How to become a ‘root user’ in Linux?
root user is a privileged user in Linux, which is similar to an administrator in Windows. All kind of administrative operations can be performed using root user privilege hence it …
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How to Remove files older than ‘N’ days using Tmpwatch/Tmpreaper on Linux
You may have missed to delete some files that are no longer needed on your computer in some directory. It could be either in “Download” or any other directory that …
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How to execute a command or script at reboot or startup
Well-known services in Linux can be added on boot time without any problems, because most of them come with their own script, which is done using ‘chkconfig’ and ‘systemctl’ commands. …
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How to delete lines from a file using sed command
sed command stands for Stream Editor. It is used to perform basic text transformations in Linux. sed is one of the important command, which plays major role in file manipulations. …
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How to verify if NTP sync is working on Linux?
NTP stand for Network Time Protocol, which synchronizes the clock between computer systems over the network. NTP server keep all the servers in-sync with accurate time to perform time based …
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How to Enable (UP)/Disable (DOWN) Network Interface Port (NIC) in Linux?
In servers, Network interfaces either physical or virtual can be enabled or disabled by running some commands. If any change is performed in NIC due to which the interface is …
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